For a listing of all the notes in all keys and
all the note numbers for each type of chord
please click here.
This calculator is incredibly easy to use.
To find the notes and the note numbers of a G 11th chord, just click the "G" button, then click the "11th" button.
You will then see that the notes are G B D F A C and the note numbers are 1 3 5 b7 9 11